(x-3)^2+x(1-x)=3
x^2-2.x.3+3^2+x-x^2=3
-6x+9+x=3
-5x=12
x=-6/5
Đáp án: x= 1,2
Giải thích các bước giải:
<=> x^2-6x+9+x-x^2=3
<=>-5x+9=3
<=>-5x=-6
<=>x=1,2
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